Double-Blind Assessment of the Value of Magnetic Resonance Imaging in the Diagnosis of

ABSTRACT: A prospective double-blind study was undertaken to evaluate the usefulness of magnetic res-onance imaging in the accurate interpretation of path-ological intra-articular changes in the knee. Forty-seven patients who were scheduled to have arthroscopy and three patients who were to have arthrotomy volunteered for magnetic resonance imaging preoperatively. The ra-diologists had no clinical or roentgenographic infor-mation about the patients before the evaluation of the magnetic resonance images, and the radiologists ’ inter-pretations were unknown to the surgeon before the ar-throscopy or arthrotomy was done. Our important observations were limited to the findings in the menisci and in the anterior cruciate ligament. Magnetic resonance imaging had a positive predic